Gzip comperssion isn't working enabling for me

gzip is not working properly:
- Your server may not have the "deflate" module enabled (mod_deflate for Apache, ngx_http_gzip_module for NGINX)
- Another plugin may be interfering with the configuration
If re-checking and restarting does not resolve, please check

this is what is coming up for me which are some plugins that could be interfering?